The Blonde and Her Melons

This blonde was walking down a road, when this guy came along. The blond was carrying a bag. The guy goes, 'What are you carrying?' She goes, 'Melons.' The guy goes, 'Cool. if I can guess how many there are, can I have one of them?' The blonde giggles and goes, 'If you can guess how many there are, you can have BOTH of them.'